2019 Apr 04

# Special talk : Prof. Efim Zelmanov (UCSD) : Growth Functions

## Lecturer:

Prof. Efim Zelmanov (UCSD)
12:00pm to 1:00pm

## Location:

Ross 70
We will discuss growth functions of algebras and monoids.
2019 Mar 26

# Dynamics Seminar: Nattalie Tamam "Diagonalizable groups with non-obvious divergent trajectories"

12:00pm to 1:00pm

## Location:

Manchester faculty club
Singular vectors are the ones for which Dirichlet’s theorem can be infinitely improved. For example, any rational vector is singular. The sequence of approximations for any rational vector q is 'obvious'; the tail of this sequence contains only q. In dimension one, the rational numbers are the only singulars. However, in higher dimensions there are additional singular vectors. By Dani's correspondence, the singular vectors are related to divergent trajectories in Homogeneous dynamical systems. A corresponding 'obvious' divergent trajectories can also be defined.
2019 Mar 28

# Basic Notions: Benjamin Weiss (HUJI) "Groups with property T have and "cost" of equivalence relations"

4:00pm to 5:15pm

## Location:

Ross 70
The cost of a measure-preserving equivalence relation is a quantitative measure of its complexity. I will explain what the cost is and then discuss a recent result of Tom Hutchcroft and Gabor Pete in which they construct, for any group with property T, a free ergodic measure preserving action with cost 1.
2019 Mar 25

# NT & AG Lunch: Ehud DeShalit "An overview of class field theory, II"

1:00pm to 2:00pm

## Location:

Faculty lounge, Math building
Class field theory classifies abelian extensions of local and global fields in terms of groups constructed from the base. We shall survey the main results of class field theory for number fields and function fields alike. The goal of these introductory lectures is to prepare the ground for the study of explicit class field theory in the function field case, via Drinfeld modules. I will talk for the first 2 or 3 times.
2019 Mar 26

# T&G: Vivek Shende (Berkeley), Quantum topology from symplectic geometry

1:00pm to 2:30pm

## Location:

Room 110, Manchester Building, Jerusalem, Israel
The discovery of the Jones polynomial in the early 80's was the beginning of quantum topology'': the introduction of various invariants which, in one sense or another, arise from quantum mechanics and quantum field theory. There are many mathematical constructions of these invariants, but they all share the defect of being first defined in terms of a knot diagram, and only subsequently shown by calculation to be independent of the presentation. As a consequence, the geometric meaning has been somewhat opaque.
2019 Jun 26

# Logic Seminar - tba

11:00am to 1:00pm

Ross 63
2019 Mar 20

# Logic Seminar - Spencer Unger

11:00am to 1:00pm

## Location:

Ross 63

Stationary reflection and the singular cardinals hypothesis.
2019 Jun 12

# Logic Seminar - Shlomo Eshel

11:00am to 1:00pm

Ross 63
2019 May 29

# Logic Seminar - Nadav Meir

11:00am to 1:00pm

Ross 63
2019 May 01

# Logic Seminar - Mirna Dzamonja

11:00am to 1:00pm

Ross 63
2019 May 15

# Logic Seminar - Shimon Garti

11:00am to 1:00pm

Ross 63
2019 Mar 27

# Logic Seminar - Shlomo Eshel

11:00am to 1:00pm

Ross 63
2019 Jun 19

# Logic Seminar - Moshe Illouz

11:00am to 1:00pm

Ross 63
2019 Jun 05

# Logic Seminar - Oren Kalish

11:00am to 1:00pm

Ross 63
2019 May 22

# Logic Seminar - Shahar Oriel

11:00am to 1:00pm

Ross 63